Moisture conditioning of wood using a continuous microwave dryer

Sethy, Anil Kumar; Torgovnikov, G; Vinden, Peter; Przewloka, Simon

doi:10.1080/07373937.2015.1052502

Cited by 17 publications

(11 citation statements)

References 11 publications

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“…Reduction in moisture content compared to untreated groups found by [45]. Sethy et al [47] pointed out that drying the wood until 5% or 6% MC is not economically reasonable using conventional drying methods without causing undesirable drying problems. According to the authors, wood elements with lower MC need to be chemically modified.…”

Section: Wood Dryingmentioning

confidence: 96%

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State of the Art of Microwave Treatment of Wood: Literature Review

Mascarenhas

Dias

Christofóro

2021

Forests

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This paper presents a survey of the state of the art of microwave (MW) treatment of wood, informed by both past and recent research papers. It begins by introducing the main concepts regarding MW technology and its advantages, presenting a holistic perspective of this technology, and identifying 57 research papers published over the last 25 years. Next, an extensive literature review of the most significant experimental research papers is provided, divided into two MW heating treatment uses: wood drying and permeability improvement. For each study, the wood species, MW parameters, main objectives, and overall conclusions are provided. In this context, an explanation is given on how parameters such as MW power, frequency, intensity, and exposure time, as well as initial moisture content, influence the degree of wood modification. Next, a global overview of the most used wood species, genera, and dimensions is revealed. The paper concludes by indicating the potential fields of future research studies concerning the uses and applications of MW treatment technology.

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Section: Wood Dryingmentioning

confidence: 96%

“…As stated by other authors [23,38,40], the drying was uniform within the specimens, generating fewer drying defects. The authors also suggested that MW technology may be used for this purpose in a reduced period and that further investigations using different wood species and dimensions are necessary [47].…”

Section: Wood Dryingmentioning

confidence: 99%

State of the Art of Microwave Treatment of Wood: Literature Review

Mascarenhas

Dias

Christofóro

2021

Forests

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“…Microwave (MW) wood modification is an environmentally friendly modification technique with relatively low energy consumption [15] when compared to some other modification techniques, and supports various wood processing operations by significantly improving permeability, treatability, and uptake of wood preservatives [16][17][18][19][20][21][22]. Microwave treatment of wood is particularly useful for less permeable wood, as in this way we can improve the impregnability of the wood and achieve more effective protection to increase its resistance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Energy Intensities of Microwave Treatment on Heartwood and Sapwood Microstructures in Norway Spruce

Ganguly

Balzano

Petrič

et al. 2021

Forests

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Microwave modification can increase the permeability of wood by delaminating and rupturing its anatomical microstructures at their weak points. A high degree of intensity of microwave modification can cause significant structural damage to the microstructures of wood, resulting in poorer strength properties. The objective of this study was to evaluate the changes in the anatomical structure of Norway spruce (Picea abies (L.) Karst.) heartwood and sapwood after microwave modification in order to develop the most effective treatment in terms of applied energy without causing significant structural damage. Analysis with light and scanning electron microscopy were performed to evaluate the effect of microwave treatment for two different energy intensities, moderate and high intensity. The results indicated structural changes in the tracheid cells. Microscopy showed varying degrees of modification within the wood microstructure, with the heartwood samples showing a greater anatomical distortion compared to their sapwood counterparts. Furthermore, the samples were subjected to pycnometric density measurements, which indicated a reduction in skeletal and absolute density after microwave modification, for both high and moderate intensity treatment on sapwood and heartwood samples. With increasing microwave energy, a gradual increase in specific pore volume and porosity percentage of the samples were also detected.

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“…Microwave modification is an eco-friendly technique that reduces energy consumption (Sethy et al 2016) and aids in several wood processing operations such as seasoning and preservative treatment by significantly improving wood's permeability and preservative uptake, resulting in its effective use for a longer period in service. Previous research on microwave (MW) showed a positive impact on retention and penetration of wood pertaining to moderate and high refractory index with different chemicals and catalysts (Samani et al 2019, Ganguly and Tripathi 2018, Vinden et al 2017, Terziev and Daniel 2013, Sethy et al 2012, Dashti et al 2012, Torgovnikov and Vinden 2009.…”

Section: Introductionmentioning

confidence: 99%